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HL: Fachverband Halbleiterphysik

HL 79: Poster: New Materials

HL 79.1: Poster

Donnerstag, 23. März 2017, 15:00–19:00, P2-OG3

Exciton recombination dynamics of graphene nanoribbons probed by time-resolved Raman spectroscopy — •Raphael German, Jinghi Zhu, Boris Senkovskiy, Alexander Grüneis, and Paul H.M. van Loosdrecht — II.Physikalisches Institut Köln, Zülpicher Str. 77, 50937 Köln

Graphene based materials show remarkable chemical, electrical and optical properties. Recently, it has been shown that one can grow atomically precise one-dimensional graphene nanoribbons. Here, we investigate armchair graphene nanoribbons of N=7 carbon atoms width transferred onto the insulating substrate, using steady state and time-resolved spontaneous Raman spectroscopy. The Raman signal shows a resonance near 2.2 eV, consistent with the energy level structure. The time-dependent Raman data is interpreted in terms of exciton recombination dynamics, indicating that exciton recombination occurs mainly through exciton-exciton annihilation which is limited by one-dimensional diffusion.